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The second category is temporarily stored data related to the network. Such as location area identification code (LAI), mobile user temporary identification code (TMSI), public telephone network code prohibited from access, etc.

Specifically, its functions mainly reflect the following aspects. The data stored by SIM card can be divided into four categories: the first category is fixed data. This type of data is written by the SIM card center before the mobile phone is sold, including the International Mobile Subscriber Identification Number (IMSI), authentication key (KI), authentication and encryption algorithm, etc.